The average rate on a 30-year U.S. mortgage ticked up this week, ending a four-week slide that brought down borrowing costs for homebuyers to the lowest level in nearly a year.

The rate rose to 6.3% from 6.26% last week, mortgage buyer Freddie Mac said Thursday. A year ago, the rate averaged 6.08%.

Borrowing costs on 15-year fixed-rate mortgages, popular with homeowners refinancing their home loans, also edged higher. The average rate rose to 5.49% from 5.41% last week. A year ago, it was 5.16%, Freddie Mac said.

Mortgage rates are influenced by several factors, from the Federal Reserve’s interest rate policy decisions to bond market investors’ expectations for the economy and inflation. They generally follow the trajectory of the 10-year Treasury yield, which lenders use as a guide to

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